CVE-2017-18873 json
Mattermost Server is vulnerable to channel invisibility DoS via misformatted post
published 2020-06-19 6 y ago modified 2026-06-17 4 mo ago also GHSA-x6mw-hf2j-vqpc , GO-2026-4282 , EUVD-2017-9963
- cvss
- 5.3
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 66%
- public exploits
- 0
- none known
Summary
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. It allows attackers to cause a denial of service (channel invisibility) via a misformatted post.
Patch / fix
- go github.com/mattermost/mattermost-server 4.1.2-0.20171013141717-ee57a5829ab1, 4.1.2-0.20171013141717-ee57a5829ab1+incompatible, 4.2.1-0.20171013140502-b3e4b0ac9168, 4.2.1-0.20171013140502-b3e4b0ac9168+incompatible, 4.3.0, 4.3.0+incompatible
- mattermost mattermost_server 4.1.2, 4.2.1
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20260226T182644-150000.1.149.1
suse advisories SUSE-SU-2026:0757-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
Exploit prediction
1.11% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
| GitHub | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server | <4.1.2-0.20171013141717-ee57a5829ab1 >=4.2.0, <4.2.1-0.20171013140502-b3e4b0ac9168 >=4.3.0-rc1, <4.3.0 <4.1.2-0.20171013141717-ee57a5829ab1+incompatible >=4.2.0+incompatible, <4.2.1-0.20171013140502-b3e4b0ac9168+incompatible >=4.3.0-rc1+incompatible, <4.3.0+incompatible |
4.1.2-0.20171013141717-ee57a5829ab1 4.2.1-0.20171013140502-b3e4b0ac9168 4.3.0 4.1.2-0.20171013141717-ee57a5829ab1+incompatible 4.2.1-0.20171013140502-b3e4b0ac9168+incompatible 4.3.0+incompatible |
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
github.com
/mattermost/mattermost/commit/9adaf53e110e0e806b21903111aacb93129668cb
web
-
github.com
/mattermost/mattermost/commit/b3e4b0ac91682093276a653f7ccd5774aaa9cd06
web
-
github.com
/mattermost/mattermost/commit/ee57a5829ab162859e0e355dac6cfe6ca1a8f379
web
-
mattermost.com
/security-updates/
vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2017-18873
advisory
-
github.com
/mattermost/mattermost
package
-
mattermost.com
/security-updates
web
-
github.com
/advisories/GHSA-x6mw-hf2j-vqpc
advisory
Sources
- CVE List CVE-2017-18873
- GitHub Advisory GHSA-x6mw-hf2j-vqpc
- NVD CVE-2017-18873
- OSV GO-2026-4282
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.